UI Embedding works with externally hosted apps regardless of the front-end framework they’re built in. You can reuse an app you already have instead of rebuilding it in a Salesforce-specific framework.
Framework Compatibility
Because Salesforce embeds your app as an externally hosted app in a sandboxed iframe, it interacts with your app through the standards-based embedding protocol rather than through framework-specific code. Any standards-based web app works.
Externally hosted embedding has been validated with React, Angular, and Vue apps. Automated test coverage is React-based.
Framework compatibility applies to externally hosted apps. Internally hosted UI Bundles have their own framework support details.
Note
How to Use It
Point the src attribute of lightning-ui-embedding at your hosted app, regardless of the framework your app uses. To build and embed the wrapper component, see Get Started with UI Embedding.